一.出现问题的场景
我们在AM5728在长稳时，碰到eth1的网络异常
----eth1分配了一个内网IP；其他从CPU ping AM5728的eth1 IP，发现ping不通
定位情况：
1..发现有这个报错： NETDEV WATCHDOG: eth1 (cpsw): transmit queue 0 timed out
2.同时，有Backtrace，在底下第四点所示
二.我的开发环境描述
内核版本：4.4.12-g3639bea54a
SDK版本：ti-processor-sdk-linux-am57xx-evm-03.03.00.04
三.我的问题。
1.请问TI是否有关于AM5728，这类问题有专门解决方案吗？(我在你们官网上看到你们多款芯片均出现这个问题，这个应该是你们的TI的共性问题)
2.通过你们在线工程工程师提问推荐了一个帖子。这个帖子只是提供一个规避方案。对这个规避方案有个疑问
e2e.ti.com/.../am5726-netdev-watchdog-eth0-cpsw-transmit-queue-0-timed-out
在规避方案中提到的：
I'm planning to double the descriptor pool size, that currently it is 1024
----这个pool size 是什么，改哪里的呢？怎么改的？
3.除了2中所说的规避方案，还有正面解决的方案吗？
四.详细错误时内核的堆栈信息如下所示
[2023-09-22 14:29:s][ 1100.978464] ------------[ cut here ]------------
[2023-09-22 14:29:s][ 1100.983150] WARNING: CPU: 1 PID: 0 at net/sched/sch_generic.c:306 dev_watchdog+0x26c/0x278()
[2023-09-22 14:29:s][ 1100.991665] NETDEV WATCHDOG: eth1 (cpsw): transmit queue 0 timed out
[2023-09-22 14:29:s][ 1100.998055] Modules linked in: sha512_generic(O) sha512_arm(O) cbc(O) drbg(O) bsp_product_key(O) bsp_lan_switch(O) bsp_audio_control(O) pcie_rc(O) bsp_automgr_drv(O) bsp_it6801_drv(O) bsp_gpio(O) bsp_adv7604_drv(O) bsp_gs2972_drv(O) bsp_gs2971_drv(O) bsp_mdin380_drv(O) bsp_drvMgr_drv(O) bsp_crosslink(O) snd_soc_simple_card(O) snd_soc_evm(O) mcasp8_codec(O) mcasp7_codec(O) mcasp6_codec(O) mcasp5_codec(O) mcasp4_codec(O) mcasp3_codec(O) mcasp1_codec(O) ad1937(O) snd_soc_davinci_mcasp(O) snd_soc_omap(O) snd_soc_edma(O) snd_soc_core(O) snd_pcm_dmaengine(O) snd_pcm(O) snd_timer(O) snd_rawmidi(O) snd(O) soundcore(O) bsp_netlink(O) stm32_dev(O) bsp_spi_rw(O) bsp_i2c_rw(O) rpmsg_rpc(O) rpmsg_proto(O) virtio_rpmsg_bus(O) cryptodev(O) cmemk(O) pruss_intc(O) dwc3(O) udc_core(O) pru_rproc(O) omap_sham(O) omap_aes_driver(O) pruss(O) omap_wdt(O) ahci_platform(O) libahci_platform(O) libahci(O) libata(O) ti_vpe(O) ti_sc(O) ti_vpdma(O) dwc3_omap(O) rtc_omap(O) omap_des(O) omap_rng(O) rng_core(O) extcon_palmas(O) extcon(O) rtc_palmas(O) rtc_ds1307(O) omap_remoteproc(O) remoteproc(O) virtio(O) virtio_ring(O) sch_fq_codel(O)
[2023-09-22 14:29:s][ 1101.097239] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G O 4.4.12-g3639bea54a #18
[2023-09-22 14:29:s][ 1101.105538] Hardware name: Generic DRA74X (Flattened Device Tree)
[2023-09-22 14:29:s][ 1101.111654] Backtrace:
[2023-09-22 14:29:s][ 1101.114133] [<c00130a8>] (dump_backtrace) from [<c00132a4>] (show_stack+0x18/0x1c)
[2023-09-22 14:29:s][ 1101.118504] ldq enter SNDRV_PCM_TRIGGER_STOP snd_dmaengine_pcm_trigger 231
[2023-09-22 14:29:s][ 1101.121488] dmaengine_pcm_prepare_and_submit 168 chan_id=9 dma_addr=0xfe080000 direction=1
[2023-09-22 14:29:s][ 1101.121495] callback=0xbf754460 param=0xed2a6000
[2023-09-22 14:29:s][ 1101.141434] ldq enter SNDRV_PCM_TRIGGER_STOP snd_dmaengine_pcm_trigger 231
[2023-09-22 14:29:s][ 1101.148448] r7:c061ff44 r6:200e0113 r5:00000000 r4:c0a1708c
[2023-09-22 14:29:s][ 1101.154167] [<c001328c>] (show_stack) from [<c02e3148>] (dump_stack+0x90/0xa4)
[2023-09-22 14:29:s][ 1101.161422] [<c02e30b8>] (dump_stack) from [<c00366ec>] (warn_slowpath_common+0x88/0xb8)
[2023-09-22 14:29:s][ 1101.167094] dmaengine_pcm_prepare_and_submit 168 chan_id=9 dma_addr=0xfe080000 direction=1
[2023-09-22 14:29:s][ 1101.167100] callback=0xbf754460 param=0xed2a6000
[2023-09-22 14:29:s][ 1101.182467] r7:c061ff44 r6:00000132 r5:00000009 r4:ee0a3da8[ 1101.187039] ldq enter SNDRV_PCM_TRIGGER_STOP snd_dmaengine_pcm_trigger 231
[2023-09-22 14:29:s]
[2023-09-22 14:29:s][ 1101.194893]
[2023-09-22 14:29:s][ 1101.196570] [<c0036664>] (warn_slowpath_common) from [<c0036754>] (warn_slowpath_fmt+0x38/0x40)
[2023-09-22 14:29:s][ 1101.205302] r8:ee690800 r7:00000001 r6:c09f4100 r5:ee35d800 r4:c0948a24
[2023-09-22 14:29:s][ 1101.212080] [<c0036720>] (warn_slowpath_fmt) from [<c061ff44>] (dev_watchdog+0x26c/0x278)
[2023-09-22 14:29:s][ 1101.212650] dmaengine_pcm_prepare_and_submit 168 chan_id=9 dma_addr=0xfe080000 direction=1
[2023-09-22 14:29:s][ 1101.212655] callback=0xbf754460 param=0xed2a6000
[2023-09-22 14:29:s][ 1101.232594] ldq enter SNDRV_PCM_TRIGGER_STOP snd_dmaengine_pcm_trigger 231
[2023-09-22 14:29:s][ 1101.240106] r3:ee35d800 r2:c0948a24
[2023-09-22 14:29:s][ 1101.243706] r4:00000000
[2023-09-22 14:29:s][ 1101.246259] [<c061fcd8>] (dev_watchdog) from [<c008a218>] (call_timer_fn+0x30/0x9c)
[2023-09-22 14:29:s][ 1101.253944] r10:c061fcd8 r9:ee35d800 r8:eed243e0[ 1101.258196] dmaengine_pcm_prepare_and_submit 168 chan_id=9 dma_addr=0xfe080000 direction=1
[2023-09-22 14:29:s][ 1101.258201] callback=0xbf754460 param=0xed2a6000
[2023-09-22 14:29:s]
[2023-09-22 14:29:s][ 1101.271427] r7:c061fcd8 r6:00000101 r5:eed243c0
[2023-09-22 14:29:s][ 1101.276256] r4:ffffe000[ 1101.278142] ldq enter SNDRV_PCM_TRIGGER_STOP snd_dmaengine_pcm_trigger 231
[2023-09-22 14:29:s]
[2023-09-22 14:29:s][ 1101.285516]
[2023-09-22 14:29:s][ 1101.287193] [<c008a1e8>] (call_timer_fn) from [<c008a414>] (run_timer_softirq+0x190/0x208)
[2023-09-22 14:29:s][ 1101.295488] r7:00000200 r6:00000000 r5:eed243c0 r4:ee35da64
[2023-09-22 14:29:s][ 1101.301206] [<c008a284>] (run_timer_softirq) from [<c003a138>] (__do_softirq+0x11c/0x234)
[2023-09-22 14:29:s][ 1101.303818] dmaengine_pcm_prepare_and_submit 168 chan_id=9 dma_addr=0xfe080000 direction=1
[2023-09-22 14:29:s][ 1101.303823] callback=0xbf754460 param=0xed2a6000
[2023-09-22 14:29:s][ 1101.322336] r10:40000001[ 1101.323764] ldq enter SNDRV_PCM_TRIGGER_STOP snd_dmaengine_pcm_trigger 231
[2023-09-22 14:29:s]
[2023-09-22 14:29:s][ 1101.331685] r9:00000001 r8:c09f4080 r7:00000101 r6:ee0a2000 r5:c09f4084
[2023-09-22 14:29:s][ 1101.338623] r4:00000020
[2023-09-22 14:29:s][ 1101.341175] [<c003a01c>] (__do_softirq) from [<c003a544>] (irq_exit+0xbc/0x11c)
[2023-09-22 14:29:s][ 1101.348512] r10:c09f44f8 r9:c070b444[ 1101.351138] dmaengine_pcm_prepare_and_submit 168 chan_id=9 dma_addr=0xfe080000 direction=1
[2023-09-22 14:29:s][ 1101.351144] callback=0xbf754460 param=0xed2a6000
[2023-09-22 14:29:s]
[2023-09-22 14:29:s][ 1101.364946] r8:ee008000 r7:00000000 r6:00000000 r5:00000013
[2023-09-22 14:29:s][ 1101.370833] r4:ffffe000[ 1101.371088] ldq enter SNDRV_PCM_TRIGGER_STOP snd_dmaengine_pcm_trigger 231
[2023-09-22 14:29:s]
[2023-09-22 14:29:s][ 1101.380094]
[2023-09-22 14:29:s][ 1101.381774] [<c003a488>] (irq_exit) from [<c007a2a8>] (__handle_domain_irq+0x68/0xbc)
[2023-09-22 14:29:s][ 1101.389635] r5:00000013 r4:c09ed430
[2023-09-22 14:29:s][ 1101.393243] [<c007a240>] (__handle_domain_irq) from [<c000948c>] (gic_handle_irq+0x40/0x7c)
[2023-09-22 14:29:s][ 1101.396767] dmaengine_pcm_prepare_and_submit 168 chan_id=9 dma_addr=0xfe080000 direction=1
[2023-09-22 14:29:s][ 1101.396773] callback=0xbf754460 param=0xed2a6000
[2023-09-22 14:29:s][ 1101.414549] r9:c070b444[ 1101.416719] ldq enter SNDRV_PCM_TRIGGER_STOP snd_dmaengine_pcm_trigger 231
[2023-09-22 14:29:s]
[2023-09-22 14:29:s][ 1101.423809] r8:fa213000 r7:fa212000 r6:ee0a3f40 r5:fa21200c r4:c09f4894
[2023-09-22 14:29:s][ 1101.430754] [<c000944c>] (gic_handle_irq) from [<c0013d80>] (__irq_svc+0x40/0x74)
[2023-09-22 14:29:s][ 1101.438265] Exception stack(0xee0a3f40 to 0xee0a3f88)
[2023-09-22 14:29:s][ 1101.442397] dmaengine_pcm_prepare_and_submit 168 chan_id=9 dma_addr=0xfe080000 direction=1
[2023-09-22 14:29:s][ 1101.442403] callback=0xbf754460 param=0xed2a6000
[2023-09-22 14:29:s][ 1101.456258] 3f40: 00000001 00000000 fe600000 00000000 ee0a2000 c09f44ac 00000000 00000000
[2023-09-22 14:29:s][ 1101.462346] ldq enter SNDRV_PCM_TRIGGER_STOP snd_dmaengine_pcm_trigger 231
[2023-09-22 14:29:s][ 1101.471368] 3f60: ee0a3fb0 c070b444 c09f44f8 ee0a3f9c ee0a3f7c ee0a3f90 c0028228 c0010540
[2023-09-22 14:29:s][ 1101.479577] 3f80: 600e0013 ffffffff
[2023-09-22 14:29:s][ 1101.483076] r9:c070b444 r8:ee0a3fb0 r7:ee0a3f74 r6:ffffffff[ 1101.488009] dmaengine_pcm_prepare_and_submit 168 chan_id=9 dma_addr=0xfe080000 direction=1
[2023-09-22 14:29:s][ 1101.488015] callback=0xbf754460 param=0xed2a6000
[2023-09-22 14:29:s]
[2023-09-22 14:29:s][ 1101.501527] r5:600e0013 r4:c0010540
[2023-09-22 14:29:s][ 1101.505309] [<c0010518>] (arch_cpu_idle) from [<c0070748>] (default_idle_call+0x28/0x34)
